#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <stdlib.h>
#include "simresp.h"
#include "curfile.h"

elem_select_op(file_id)
	unsigned file_id;
{
	u_char cmd[7];
	int rc;
	unsigned expect_resp_len;

	/* SELECT command APDU */
	cmd[0] = 0xA0;
	cmd[1] = 0xA4;
	cmd[2] = 0;
	cmd[3] = 0;
	cmd[4] = 2;
	cmd[5] = file_id >> 8;
	cmd[6] = file_id;
	rc = apdu_exchange(cmd, 7);
	if (rc < 0)
		return(rc);
	if (sim_resp_sw == 0x9404)
		return(0);
	if ((sim_resp_sw & 0xFF00) == 0x9F00)
		return(1);
	fprintf(stderr,
		"error or unexpected SW response to SELECT of 0x%04X: %04X\n",
		file_id, sim_resp_sw);
	return(-1);
}

select_op(file_id)
	unsigned file_id;
{
	u_char cmd[7];
	int rc;
	unsigned expect_resp_len;

	/* SELECT command APDU */
	cmd[0] = 0xA0;
	cmd[1] = 0xA4;
	cmd[2] = 0;
	cmd[3] = 0;
	cmd[4] = 2;
	cmd[5] = file_id >> 8;
	cmd[6] = file_id;
	rc = apdu_exchange(cmd, 7);
	if (rc < 0)
		return(rc);
	if ((sim_resp_sw & 0xFF00) != 0x9F00) {
		fprintf(stderr,
		"error or unexpected SW response to SELECT of 0x%04X: %04X\n",
			file_id, sim_resp_sw);
		return(-1);
	}
	expect_resp_len = sim_resp_sw & 0xFF;
	/* GET RESPONSE follow-up */
	cmd[1] = 0xC0;
	cmd[4] = expect_resp_len;
	rc = apdu_exchange(cmd, 5);
	if (rc < 0)
		return(rc);
	if (sim_resp_sw != 0x9000) {
		fprintf(stderr,
			"bad SW resp to GET RESPONSE after SELECT: %04X\n",
			sim_resp_sw);
		return(-1);
	}
	if (sim_resp_data_len != expect_resp_len) {
		fprintf(stderr,
	"error: GET RESPONSE after SELECT returned %u bytes, expected %u\n",
			sim_resp_data_len, expect_resp_len);
		return(-1);
	}
	return(0);
}

static void
show_secret_code_status(name, byte)
	char *name;
	unsigned byte;
{
	printf("Status of %s: %s, %u attempts left\n", name,
		byte & 0x80 ? "initialized" : "not initialized",
		byte & 0x0F);
}

void
show_access_conditions(oper_name, cond_code)
	char *oper_name;
	unsigned cond_code;
{
	static char *cond_names[16] =
		{"ALW", "CHV1", "CHV2", "RFU3",
		 "ADM4", "ADM5", "ADM6", "ADM7",
		 "ADM8", "ADM9", "ADM10", "ADM11",
		 "ADM12", "ADM13", "ADM14", "NEV"};

	printf("Access condition for %s: %s\n", oper_name,
		cond_names[cond_code]);
}

cmd_select(argc, argv)
	char **argv;
{
	int file_id, rc;

	if (isxdigit(argv[1][0]) && isxdigit(argv[1][1]) &&
	    isxdigit(argv[1][2]) && isxdigit(argv[1][3]) && !argv[1][4])
		file_id = strtoul(argv[1], 0, 16);
	else
		file_id = find_symbolic_file_name(argv[1]);
	if (file_id < 0) {
		fprintf(stderr,
"error: file ID argument is not a hex value or a recognized symbolic name\n");
		return(-1);
	}
	rc = select_op(file_id);
	if (rc < 0)
		return(rc);
	if (sim_resp_data_len < 14) {
		fprintf(stderr,
	"error: response length of %u bytes is too short for any file type\n",
			sim_resp_data_len);
		return(-1);
	}
	switch (sim_resp_data[6]) {
	case 0x01:
		printf("File type: MF\n");
		goto mf_or_df;
	case 0x02:
		printf("File type: DF\n");
	mf_or_df:
		if (sim_resp_data_len < 22) {
			fprintf(stderr,
		"error: response length of %u bytes is too short for MF/DF\n",
				sim_resp_data_len);
			return(-1);
		}
		printf("File characteristics: %02X\n", sim_resp_data[13]);
		printf("Number of DF children: %u\n", sim_resp_data[14]);
		printf("Number of EF children: %u\n", sim_resp_data[15]);
		printf("Number of secret codes: %u\n", sim_resp_data[16]);
		show_secret_code_status("PIN1", sim_resp_data[18]);
		show_secret_code_status("PUK1", sim_resp_data[19]);
		show_secret_code_status("PIN2", sim_resp_data[20]);
		show_secret_code_status("PUK2", sim_resp_data[21]);
		break;
	case 0x04:
		printf("File type: EF\n");
		curfile_total_size = (sim_resp_data[2] << 8) | sim_resp_data[3];
		printf("File size: %u\n", curfile_total_size);
		curfile_structure = sim_resp_data[13];
		switch (curfile_structure) {
		case 0x00:
			printf("Structure: transparent\n");
			break;
		case 0x01:
			printf("Structure: linear fixed\n");
			goto ef_record_based;
		case 0x03:
			printf("Structure: cyclic\n");
		ef_record_based:
			if (sim_resp_data_len < 15) {
				fprintf(stderr,
	"error: response length of %u bytes is too short for record-based EF\n",
					sim_resp_data_len);
				return(-1);
			}
			printf("Record length: %u\n", sim_resp_data[14]);
			curfile_record_len = sim_resp_data[14];
			if (curfile_record_len &&
			    curfile_total_size % curfile_record_len == 0) {
				curfile_record_count =
					curfile_total_size / curfile_record_len;
				printf("Number of records: %u\n",
					curfile_record_count);
			} else
				curfile_record_count = 0;
			break;
		default:
			printf("Structure: %02X (unknown)\n",
				curfile_structure);
		}
		printf("File status: %02X\n", sim_resp_data[11]);
		show_access_conditions("UPDATE", sim_resp_data[8] & 0xF);
		show_access_conditions("READ & SEEK", sim_resp_data[8] >> 4);
		show_access_conditions("INCREASE", sim_resp_data[9] >> 4);
		show_access_conditions("INVALIDATE", sim_resp_data[10] & 0xF);
		show_access_conditions("REHABILITATE", sim_resp_data[10] >> 4);
		break;
	default:
		printf("File type: %02X (unknown)\n", sim_resp_data[6]);
	}
	return(0);
}

parse_ef_select_response()
{
	if (sim_resp_data_len < 14) {
		fprintf(stderr,
		"error: SELECT response length of %u bytes is too short\n",
			sim_resp_data_len);
		return(-1);
	}
	if (sim_resp_data[6] != 0x04) {
		fprintf(stderr, "error: selected file is not an EF\n");
		return(-1);
	}
	curfile_total_size = (sim_resp_data[2] << 8) | sim_resp_data[3];
	curfile_structure = sim_resp_data[13];
	switch (curfile_structure) {
	case 0x00:
		/* transparent */
		break;
	case 0x01:
	case 0x03:
		/* record-based */
		if (sim_resp_data_len < 15) {
			fprintf(stderr,
"error: SELECT response length of %u bytes is too short for record-based EF\n",
				sim_resp_data_len);
			return(-1);
		}
		curfile_record_len = sim_resp_data[14];
		if (!curfile_record_len) {
			fprintf(stderr,
		"error: SELECT response indicates record length of 0\n");
			return(-1);
		}
		if (curfile_total_size % curfile_record_len) {
			fprintf(stderr,
	"error: returned file size is not divisible by record length\n");
			return(-1);
		}
		curfile_record_count = curfile_total_size / curfile_record_len;
		if (curfile_record_count > 255) {
			fprintf(stderr,
			"error: EF record count exceeds protocol limit\n");
			return(-1);
		}
		break;
	default:
		fprintf(stderr, "error: unknown EF structure code %02X\n",
			curfile_structure);
		return(-1);
	}
	return(0);
}